Intervertebral Disk of First Lumbar Vertebra (L1–L2) (Discus intervertebralis L1–L2)
Educational content only — not medical advice.
Anatomy
The intervertebral disk of the first lumbar vertebra (L1–L2) lies immediately below the thoracolumbar junction, situated close to the level of the conus medullaris. Composed of an exceptionally robust anulus fibrosus and hydrated central nucleus, it bears substantial axial gravity loads while initiating the lumbar lordosis.
Clinical notes
Herniation at L1–L2 is uncommon but dangerous because of proximity to the conus medullaris and cauda equina roots; central extrusion can produce acute conus medullaris syndrome with saddle anesthesia and sphincter dysfunction.
Related structures
Educational references
FAQ
What is the role of the Intervertebral Disk of First Lumbar Vertebra (L1–L2)?
The intervertebral disk of the first lumbar vertebra (L1–L2) lies immediately below the thoracolumbar junction, situated close to the level of the conus medullaris. Composed of an exceptionally robust anulus fibrosus and hydrated central nucleus, it bears substantial axial gravity loads while initiating the lumbar lordosis.
Why is the Intervertebral Disk of First Lumbar Vertebra (L1–L2) clinically important?
Herniation at L1–L2 is uncommon but dangerous because of proximity to the conus medullaris and cauda equina roots; central extrusion can produce acute conus medullaris syndrome with saddle anesthesia and sphincter dysfunction.
Source & license
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